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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Strings; |
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use Exception; |
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use InvalidArgumentException; |
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use function count; |
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/** |
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* `CombinedRegexp` optimizes matching of multiple regular expressions. |
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* Read more about the concept in |
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* {@see https://nikic.github.io/2014/02/18/Fast-request-routing-using-regular-expressions.html}. |
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*/ |
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final class CombinedRegexp extends AbstractCombinedRegexp |
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{ |
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/** |
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* @var string[] |
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*/ |
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private array $patterns; |
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private string $compiledPattern; |
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/** |
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* @param string[] $patterns Regular expressions to combine. |
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* @param string $flags Flags to apply to all regular expressions. |
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*/ |
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public function __construct( |
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array $patterns, |
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private string $flags = '' |
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) { |
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if (empty($patterns)) { |
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throw new InvalidArgumentException('At least one pattern should be specified.'); |
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} |
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$this->patterns = array_values($patterns); |
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$this->compiledPattern = $this->compilePatterns($this->patterns) . $this->flags; |
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} |
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/** |
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* @return string The compiled pattern. |
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*/ |
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public function getCompiledPattern(): string |
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{ |
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return $this->compiledPattern; |
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} |
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/** |
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* Returns `true` whether the given string matches any of the patterns, `false` - otherwise. |
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*/ |
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public function matches(string $string): bool |
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{ |
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return preg_match($this->compiledPattern, $string) === 1; |
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} |
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/** |
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* Returns pattern that matches the given string. |
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* @throws Exception if the string does not match any of the patterns. |
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*/ |
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public function getMatchingPattern(string $string): string |
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{ |
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return $this->patterns[$this->getMatchingPatternPosition($string)]; |
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} |
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/** |
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* Returns position of the pattern that matches the given string. |
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* @throws Exception if the string does not match any of the patterns. |
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*/ |
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public function getMatchingPatternPosition(string $string): int |
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{ |
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$match = preg_match($this->compiledPattern, $string, $matches); |
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if ($match !== 1) { |
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$this->throwFailedMatchException($string); |
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} |
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return count($matches) - 1; |
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} |
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/** |
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* @param string[] $patterns |
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* |
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* @psalm-param list<string> $patterns |
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* @psalm-return non-empty-string |
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*/ |
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private function compilePatterns(array $patterns): string |
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{ |
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$quotedPatterns = []; |
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/** |
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* Possible mutant escaping, but it's ok for our case. |
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* It doesn't matter where to place `()` in the pattern: |
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* https://regex101.com/r/lE1Q1S/1, https://regex101.com/r/rWg7Fj/1 |
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*/ |
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foreach ($patterns as $i => $pattern) { |
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$quotedPatterns[] = $pattern . str_repeat('()', $i); |
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} |
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$combinedRegexps = '(?|' . strtr( |
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implode('|', $quotedPatterns), |
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[self::REGEXP_DELIMITER => self::QUOTE_REPLACER] |
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) . ')'; |
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return self::REGEXP_DELIMITER . $combinedRegexps . self::REGEXP_DELIMITER; |
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} |
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public function getPatterns(): array |
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{ |
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return $this->patterns; |
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} |
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public function getFlags(): string |
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{ |
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return $this->flags; |
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} |
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} |
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yiisoft /
strings
